Good reminder

Absolutely, we'll get there someday :)

Cool, never heard of it before

That is very cool. I'm tempted; let me think about it.

I wholeheartedly agree!

It would probably work, but pollys also have different characteristics so no guarantee

@@Epictronics1 Lower ESR, can deal better with higher voltage. After a bit of research its apparently preferable to use these in Audio equipment and monitors instead of the normal electrolytic capactitors. I will try to use them from now on for recapping drives and such. Hopefully they cause no complications afterwards.

Quite possible

Obviously :)

Could be, but my other SLCs are recognized as such in speedsys. This CPU is identified as a 386DX @21MHz

They're ultimately Intel-designed 386DX, even if IBM fabbed them. The IBM 386SLC, 486SLC2, and 486SLC3 are 16-bit data bus and 24-bit address bus; These are fully 32-bit CPUs. Years ago, I tested them for the 'CPU Reset Signature', which Intel started implementing on the 386-class CPUs. The "silver-cap" CPUs give Intel responses. I can't provide links for someone else's channel, but here are the FRUs of several different versions, with these implementations actually being common for the PS/2 Model 70 and 80: FRU 23F7189 is CPUID 0304h (C Step), likely 16 or 20MHz FRU 51F1783 is likely a CPUID 0304h (C Step), 20MHz or Step D0, 16MHz FRU 51F1784 is likely a CPUID 0305h (Step D0), 20MHz FRU 51F0352 is an unknown stepping, 20MHz FRU 32G3366 is an unknown stepping, 25MHz FRU 51F1797 is CPUID 0305h (Step D0), 25MHz FRU 63F7615 is CPUID 0305h (Step D0), 25MHz As you said, the IBM 'SLC' CPUs are derived from the Intel 386SX codemask - the licensing agreement was that IBM could only use any derivative CPUs in IBM systems, not to package them for use and sell them where they could be on other brands. They also give a different sequence for the CPU Reset Signature (what became the 'CPUID' of the 486-class CPUs). Roman can provide a link to my 'INT 15h, C9h' ROM BIOS call page.

IBM fabbed these directly from Intel 386DX codemasks just to help with production for their own systems the markings on the top denote the IBM plants ('9314' was the codes for Bromont and Burlington concatenated together), and the fourth line starts with a '1' for the packaging, then a standard YYWW datecode - These CPUs were fabbed in 1990 and 1991.

I thought we would find some sort of DLC too, but speedsys reports a regular Intel chip

@@Epictronics1: Correct, there's no on-chip cache (the 'C' of the IBM part identification) or clock-multiplying - It's just an Intel core inn IBM packaging to help with production. CPU test programs don't check the CPU Reset Signature, for one, I've only seen IBM BIOSes provide that information at the 386 level anyway; It's easy to use DOS DEBUG or ROM-BASIC to retrieve that data. When the CPU is powered on or reset, it has the CPU Reset Signature in the DX register - that value must be saved away by the BIOS before it is overwritten as the system POSTs. Intel first implemented the CPU Reset Signature with the 386-class CPUs (and I've only seen IBM BIOSes save the value away for the 386 level, Phoenix BIOSes did it at the 486 level), and it became the "CPUID" instruction later, available at any time as the CPU operated.

I did, but couldn't find anything

@@Epictronics1 that’s a shame, what a unique package tho, thanks for showing it to us.

@@Cybernetic_Systems: The IBM FRU encodes the clocking speed and "stepping" of the chip; There were several versions produced: FRU 23F7189 is CPUID 0304h (C Step), likely 16 or 20MHz FRU 51F1783 is likely a CPUID 0304h (C Step), 20MHz or Step D0, 16MHz FRU 51F1784 is likely a CPUID 0305h (Step D0), 20MHz FRU 51F0352 is an unknown stepping, 20MHz FRU 32G3366 is an unknown stepping, 25MHz FRU 51F1797 is CPUID 0305h (Step D0), 25MHz FRU 63F7615 is CPUID 0305h (Step D0), 25MHz With the packaging, there is a '9314' that denotes the IBM plant code ('93' is Bromont, Canada, and '14' is Burlington, Vermont). On the fourth line, there is a leading '1' for the packaging style, then a standard 'YYWW' datecode (showing 1990 or 1991 for these chips). The Intel copyright is for 1985, bcause that was for when they designed the 386DX. Search on the FRUs I've listed for other pictures of the chips - CPU World has pictures, and there is a page about testing these CPUs as well.

I didn't do anything special. I just plugged it in

@ Thanks for that I always get an out of range message. What model is your Thinkvision?

@@guzf344 It's an L180p

@ Thank you! Love your channel. So much fun to watch!

@@guzf344 Thanks!

I'll keep putting them back for him :)

@@Epictronics1 I appreciate that. It's a gracious gesture.😊

@@Epictronics1: There's a page on the website commemorating his designs showing the PC Convertible (5140) - which was derived from for the PS/2 styling as well.

@ It also shows the 2133. Perhaps the best-looking IBM ever :)

There are the 40-pin "edge-connect" and later 34-pin (with power) "pin-connect" diskette drive - and they do swap between models (the low-end 8086-based Model 25 and Model 30 can run 1.44Mb drives because of this). IBM wanted modular designs that were 'tool-less'. The DBA-ESDI drives (as shown in the video) are even more "proprietary" to IBM.

@@IBM_Museum The issue I remember after 30 years, was mounting size. They had drives with different heights and they couldn't swap. Keep in mind, in a school system, your supply of parts was low and there always was a variety of systems of different ages.

Thanks

Thanks

After losing control of the PC market to the clone manufacturers in the mid 80s, IBM was desperate to wrestle back that control through proprietary tech like the MCA bus which could be patented. In theory that would guarantee future revenue streams through licensing that tech to others. That makes a lot of what IBM did with the PS/2 seem fascinatingly strange these days. However, the "Gang of Nine" PC makers as well as most of the rest of the PC clone makers thumbed their noses at the majority of what IBM did with the PS/2 line that made it unique in favor of open standards. Eventually, IBM went along with the rest of the market, especially after Intel released the Pentium CPUs and the PCI bus was quickly adopted for both later 486 and nearly all Pentium class PCs. IBM pretty much never tried to lead the PC market again after the PS/2 line. Eventually that all led up to IBM selling off the PC division to Lenovo in May 2005. I had a front row seat to that transition. I was working for a large independent laptop & desktop repair depot who did a lot of warranty work for IBM as well as the other big OEMs. I was at the IBM/Lenovo Think Open conference which was held at the Contemporary Resort in Disney World in Orlando, FL in May 2005. That was a wild time to say the least!

Yes, I did a google search with those part numbers

Sounds like it could be the Type 3 board

lol he knows the basics. The scsi2sd requires a modern windows PC and special software to configure it via the usb connector on the scsi2sd.....

Ken Shirriff has opened the Token-Ring controllers that are in the same packaging. Under my tests (the CPU Reset Signature), these appear to be Intel dies (as you have said). IBM did their own dies (from Intel designs; the layout is identical) for the 486DX/DX2 CPUs.

@@IBM_Museum Well, I probably should have said "don't open it unless you know how to correctly de-cap one of these". You're right, Master Ken did successfully open some of these up to display their glorious ceramic substrate and silicon wafers. But I really wouldn't recommend doing that to any chip that you actually want to ensure remains functional.

I'll give it a try, thanks

It looks like it could be

His what? 😁

It's a mix of nostalgia and a passion for well designed tech

Thanks :)

The older versions use a sort of custom partition table. I *think* the one in the video is a V5, based on the 25-pin footprint on the side, not sure. I have a V6, different chip but similar configuration table. I think only the newest versions with the RPi chip can support image files. Again, not sure, would have to look.

@@beatadalhagen On my version you can even have CD images by naming the image CD and a SCSI ID number. It has no device jumpers for the SCSi ID.

@@bonno666 you set the scsi id using windows software and connect the card to a modern pc via usb. there's a whole bunch of settings that can be tweaked in the software.